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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities:    
Net income $ 13,440 $ 14,774
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 21,861 23,269
Gain on sale of properties (2,816) (730)
Unrealized (gain) loss on derivative instruments 649 (3,483)
Provision for deferred income taxes 7,014 6,970
Loss on settlement of asset retirement obligations 40  
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (4,481) 3,294
Increase in due from related parties (96) (25)
(Increase) decrease in inventories 91 (2)
Decrease in prepaid expenses and other assets 378 5,761
Decrease in accounts payable (712) (9,500)
Increase (decrease) in accrued liabilities 332 (616)
Net Cash Provided by Operating Activities 35,700 39,712
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (33,934) (86,305)
Proceeds from sale of properties and equipment 3,681 881
Net Cash Used in Investing Activities (30,253) (85,424)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (4,138) (4,993)
Purchase of non-controlling interests (48) (149)
Increase in long-term bank debt and other long-term obligations 68,750 111,800
Repayment of long-term bank debt and other long-term obligations (68,857) (59,857)
Distribution to non-controlling interest (230) (1,148)
Net Cash (Used in) Provided by Financing Activities (4,523) 45,653
Net Increase (Decrease) in Cash and Cash Equivalents 924 (59)
Cash and Cash Equivalents at the Beginning of the Year 8,602 8,661
Cash and Cash Equivalents at the End of the Year 9,526 8,602
Supplemental Disclosures:    
Income taxes paid during the year 754 536
Interest paid during the year $ 4,183 $ 3,535